v0.1.1-beta

• Fix UnboundLocalError for time in on_data_ready (waterfall freeze)
• Move savez_compressed to background thread (unblock GUI on save)
• Save in-progress recording on closeEvent
• Rate-limit buzzer thread to prevent crash after long runs
• Add audio stream watchdog with auto-restart
• Persist all settings, band region, calibration, and spectrum view state
• Alarm auto-recording with timestamp filenames
• Add build_all.bat with isolated venv for PyInstaller packaging

Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com

v0.1.0-beta

UMIK-1 Spectrum Analyzer — v0.1.0-beta

This is the first public beta release of UMIK-1 Spectrum Analyzer.

This software is intended for educational and hobbyist use only. Do not use for formal measurements.

✨ What's included

• Real-time FFT spectrum analysis with Max-Hold trace and peak detection
• IEC standard 1/3 Octave Band bar graph mode
• Z / A / C sound pressure level weighting
• Draggable band-select region with 1/3 Octave snapping
• Interactive waterfall spectrogram
• SPL overload alarm with system beep
• miniDSP UMIK-1 .txt calibration file support
• Data recording to .npz / .csv for offline analysis
• Bundled offline data viewer (umik1_data_viewer.exe)

📦 Download

Download the pre-built Windows executable from the assets below.
Extract the zip and run UMIK_1_Spectrum_Analyzer.exe — no Python installation required.

⚠️ Known Limitations (Beta)

• Tested only on Windows 11 with UMIK-1 at 48kHz
• FFT sizes above 65536 may cause GUI slowdown
• Requires UMIK-1 calibration file for accurate SPL readings

System Requirements

• Windows 10 / 11 (64-bit)
• A supported USB measurement microphone (tested: miniDSP UMIK-1)